#include <bits/stdc++.h>
using namespace std;
#define PI 3.1415926

int main()
{
	double a;
	char c1,c2,c3;
  int h,r;
	float f;
	scanf("%d%d",  &h, &r);
  printf("%d", (int)ceil(20.0*1000/(h*PI*r*r)));

  return 0;
}
